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Thread: Tire Pressure

  1. #1
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    Tire Pressure

    I seem to lose 1 PSI of tire pressure for every degree below 0. This happens to all 4 tires especially the front set. On cold nights when it is -20 the tires go nearly flat. When the weather is warm the tire will maintain pressure for weeks.

    The rims are aluminum and the tires have about 80,000km on them with plenty of tread. Any solutions to this, other than me putting air in every morning?
    Water covers 3/4 of the earth, Jeeps cover the rest.

  2. #2
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    Cold air is more dense therefor the tires seem to loose pressure. BUT there is probably another problem here because they shouldnt drop that much. Aluminum rims oxidize and cause rims leaks. You should have them checked. Also check for a loose valve core.

  3. #3
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    ^^ correct. The colder air causes the captured air within the tire to shrink (increase in density, decrease in volume). But that should be only 1 psi for every 6 or 7. Me thinks you have corrosion on the lip of the aluminum rim. When warm, the tires are more pliable and are conforming around that corrosion. When cold you lose that pliability and the temp drop causes a pressure drop, which reduces the force applied to the bead against the rim.

    I think if you have the tires dismounted, rims cleaned and sealed, you'd be all set for a couple seasons. Unfortunately once aluminum rims lose their clearcoat, they'll oxidize every 2 or 3 years and need to be recleaned.
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  4. #4
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    The tires shouldn't lose pressure that much. Get the rims sealed wher they meet the bead and have the cores checked both inside and out.

  5. #5
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    if the tires are coming off the rims just put new valve stems in them it is the only true way to do it.

  6. #6
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    Thanks for all the feedback

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